Visualize your method as if it didn't come from PHP:
swfobject.embedSWF(logoX.swf, "logoX", "272", "321", "8.0.0",false,flashvars,params,attributes);
It's unquoted, and unless you have a javascript variable named logo.swf, it will crash and you should see an error in the FireFox Error Console here.
Your output should look like
swfobject.embedSWF("logoX.swf", "logoX", "272", "321", "8.0.0",false,flashvars,params,attributes);
so
swfobject.embedSWF(<?php echo \""logoX.swf"\";?>, "logoX", "272", "321", "8.0.0",false,flashvars,params,attributes);
might do it, if all other things are working. Also this will eventually throw you, if it hasn't already:
<script type="text/javascript" src="
../../plugins/kimili-flash-embed/js/swfobject.js"></script>
If you have the directory "plugins" at domain root, use the leading slash.
<script type="text/javascript" src="/plugins/kimili-flash-embed/js/swfobject.js"></script>
That will (normally) hook it up no matter what directory you're in.
Here's a variation that I would use ...
And what do you do to get Flash to play in FireFox, which needs <embed>?